Device for testing eyes



Jan. 8, 1929.

W. H. DUNN DEVICE FOR TESTING EYES Filed Dec. 9, 19%

Inventor W/W/m 15? pa Attornqy tioned.

Patented Jan. 8, 11929.

sure "rr ins F r WILLIAM H. DUNN, 0F DENVER, COLGRALDO.

DEVICE FOR TESTING EYES.

Application filed December), 1926. Serial No. 1535337.

This invention relates to an improved optical instrument, for use byphysicians and eye Specialists, both as an error detector and trialframe. a

As an error detector, it is intended for use by doctors who are not eyespecialists, By its use, they can ascertain the IGlX'EXCl/lVG.

needs of their patients eyes, and refer those who are in need of acomplete refraction test, to an eye specialist.

As a trial frame, he important advantage of the invention, is that itincludes a means whereby the person is able to support the device in hishand, while making the test,

thereby overcoming the disadvantages of bringlng uncomfortable we1ght tobear upon the nose of the patient, during the test, such part of thisapplication, and in which like.

numerals are employed to designate like parts throughout the same Figure1 is a front elevation of an optical instrument constructed inaccordance with the present invention,

Fig. 2 is a section taken approximately upon the plane of the line 22 ofFig. 1,

Fig. 3 is an enlarged sectional view in detail, taken approximately uponthe plane of the line 33 of Fig. 1.

In carrying out the-invention, I provide an appropriate supportinghandle, generally designated by the reference character 1, the samebeing of V-shaped design as aforemen- Inasmuch as it is formed ofresilient metal, the arms 2 are movable toward and from each other underthe action of an adjusting slide3 which is mounted thereon.

Rigidly secured to the outer end of each arm is an especially Aconstructed head 4 which includes a rigidly mounted metal disk 5 (seeFig. 2) and a rotatably mounted disk 6 of leather, or suitable materialhA pivot and fastening bolt 7 serves to support a washer 8, and aretaining thumbnut 9, this bolt passing through the central axes of thestationary and movable disks respectively and serving to maintain themin proper assembly. I 1

On the inner marginal side, the metal disk 5 is provided with a sightopening 1-O. of appropriate diameter. The rotatable disk 6 is formedwith a cooperating opening 10 and supported on the front faceadjacentthis opening,

a body constructed to formulate three pockets for. removable receptionof the cylinders used in making any refractory tests.

v is a lens holder 11. This holder,I

shown in F g. 3, comprises At'this time,l would direct attention to Fig.1, wherein it will be seen that around the upper marginal half ofeachopening 10 is a conventional meridian scale employed for locatingthe axes of the test cylinders. It will be notedthat the cylinderholders 11 are disposed in a position to facilitate insertion andremoval of the cylinders without interference. This is simply forrapidity and convenience in handling.

It will be noticed that in addition to the opening 10, each disk 6 isprovided with circumferentially spaced openings in which lenses 12, 13and 1a are fitted, and adapted to be selectively registered with theopenings 10 in the stationary disks.

' The lens 12 is representative of minus fifty (-50) the lens. 14is'representative of plus fifty (+50) and the intermediate lens 13 isindicative of plus onehundred 100).

From the foregoing description and drawings, it will be seen that I haveevolved an exceptionally simple and inexpensive structure which may beemployed in one instance as a novel trial frame, which isadvantageous inthat it includes the individual pocketsor cells for taking care of thecylinders employed in making the refractive tests. The meridian scaleover the blank openings aids in location of the aXisof the cylinder. Theslide 3 is adjustable in order to regulate the width or pupillarydistance,

The advantages of this trial frame are that it does not rest on the noseor cling to the ears, and thereby cause discomfort. The instrument isportable and can be used anywhere that an ordinary trial case frame canbe used.

As an error detector, it is intended for use by doctors who are noteyespecialists. With it, they can ascertain the refractive needs of theirpatients eyes and refer those who are in need of a complete refractiontest, to an eye specialist. In using the device, the patient may beseated the proper distance from an ordinary test card. Y The detector isplaced inhis hand, and so adjusted in front of pupillary distance isobtained. This is done by having the blank openings in front of theeyes. The first test is to: ascertain the smallest lines to be seen withthe use of both eyes on the test type. Next the solid portion of therotary disk is turned to cover one of the blanks or openings to make asingle eye test; This is repeated with the other eye. Then the minus andplus lenses are brought into place simultaneously and separately, andthe doctor can tell by the answers to the questions whether or notdefects 0- cur.

Of course, there are certain rules and regulations to be followed 1nusmg the device, but these need not be explained, as they will be betterunderstood from the actual use of the instrument.

the eyes that the right.

I use of the invention will be had from the foregoing description anddrawings. Therefore, a more lengthy description is thought unnecessary.Having thus described my invention, what I claim as new is As a newproduct of manufacture, an eye testing device comprising a resilient J-shaped handle, a slide mounted upon the arms of the handle and adaptedto move sities are fitted, and multiple cylinder hold ers associatedwith the first-named'openings on the rotatable disks.

In testimony whereof I afiix my signature.

WILLIAM H. DUNN.

